<template>
  <div class="cmt-container">
    <!-- 评论列表 -->
    <van-list
    v-model="loading"
    :finished="done"
    :immediate-check="false"
    offset="50"
    finished-text="我是有底线的"
    @load="pullUpLoadMoreFn"
    >
      <div class="cmt-list">
        <!-- 评论的 Item 项 -->
        <div class="cmt-item" v-for="item in commentList" :key="item.com_id">
          <!-- 头部区域 -->
          <div class="cmt-header">
            <!-- 头部左侧 -->
            <div class="cmt-header-left">
              <img :src="item.aut_photo" alt="" class="avatar" />
              <span class="uname">{{ item.aut_name }}</span>
            </div>
            <!-- 头部右侧 -->
            <div class="cmt-header-right">
              <van-icon
                v-if="item.is_liking"
                name="like"
                size="16"
                color="red"
                @click="likeOrDislikeCommentFn(item)"
              />
              <van-icon
                v-else
                name="like-o"
                size="16"
                color="gray"
                @click="likeOrDislikeCommentFn(item)"
              />
            </div>
          </div>
          <!-- 主体区域 -->
          <div class="cmt-body" v-html="item.content"></div>
          <!-- 尾部区域 -->
          <div class="cmt-footer">{{ formatTimeAgoFn(item.pubdate) }}</div>
        </div>
      </div>
    </van-list>

    <!-- 底部添加评论区域 - 1 -->
    <div class="add-cmt-box van-hairline--top" v-if="showCmtTop">
      <van-icon name="arrow-left" size="0.48rem" @click="$router.go(-1)" />
      <div class="ipt-cmt-div" @click="showCmtTop = false">发表评论</div>
      <div class="icon-box">
        <van-badge
          :content="totalCount"
          :max="99"
          @click.native="scrollToViewFn"
        >
          <van-icon
            name="comment-o"
            size="0.53333334rem"
            @click="scrollToViewFn"
          />
        </van-badge>
        <van-icon
        name="star"
        v-if="artObj.is_collected"
        @click="toggleCollectFn"
         size="0.53333334rem" />
        <van-icon
        v-else
        @click="toggleCollectFn"
        name="star-o" size="0.53333334rem" />
        <van-icon name="share-o" size="0.53333334rem" />
      </div>
    </div>

    <!-- 底部添加评论区域 - 2 -->
    <div class="cmt-box van-hairline--top" v-else>
      <textarea
        v-model.trim="cmtStr"
        placeholder="友善评论、理性发言、阳光心灵"
        @blur="onBlurFn"
        @keydown.enter="publishCmtFn"
      ></textarea>
      <van-button type="default" @click="publishCmtFn" :disabled="!cmtStr"
        >发布</van-button
      >
    </div>
  </div>
</template>

<script>
import {
  getCommnetListAPI,
  likeCmtAPI,
  dslikeCmtAPI,
  publishCmtAPI
} from '@/api/article'
import { Toast } from 'vant'

export default {
  name: 'comment',
  data () {
    return {
      commentList: [],
      showCmtTop: true,
      totalCount: 0, // 评论的总数
      cmtStr: '',
      loading: false,
      done: false
    }
  },
  props: {
    artId: {
      type: String,
      required: true
    },
    artObj: {
      type: Object,
      required: true
    }
  },
  created () {
    this.getCommnetList()
  },
  methods: {
    async likeOrDislikeCommentFn (item) {
      //   同步到后台
      try {
        item.is_liking
          ? dslikeCmtAPI({
            cmtId: item.com_id
          })
          : await likeCmtAPI({
            cmtId: item.com_id
          })
        // 取反
        item.is_liking = !item.is_liking
        Toast.success(item.is_liking ? '点赞成功' : '取消点赞成功')
      } catch (e) {
        Toast.fail(item.is_liking ? '点赞失败' : '取消点赞失败')
      }
    },
    // 滚动到可视区
    scrollToViewFn () {
      document.getElementById('like-box').scrollIntoView({
        behavior: 'smooth'
      })
    },
    async publishCmtFn () {
      //   this.commentList.unshift(t)
      try {
        const resp = await publishCmtAPI({
          artId: this.artId,
          data: this.cmtStr
        })
        this.commentList.unshift(resp.data.new_obj)
        this.cmtStr = ''
        // 发布完再次隐藏
        setTimeout(() => {
          this.isShowCmtTop = true
        })
        Toast.success('发布成功')
        this.totalCount++
      } catch (e) {
        Toast.success('发布失败')
      }
    },
    // 文本域失去焦点，
    onBlurFn () {
      setTimeout(() => {
        this.isShowCmtTop = true
      })
    },
    // 上拉加载更多
    pullUpLoadMoreFn () {
      // 直接调用
      this.getCommnetList()
    },
    // 封装起来
    async getCommnetList () {
      const resp = await getCommnetListAPI({
        artId: this.artId,
        offset: this.offset
      })
      const { results, total_count: totalCount, last_id: lastId } = resp.data
      if (lastId === null || results.length < 10) {
        Toast.success('触底了')
        this.done = true
        return
      }
      this.offset = lastId
      this.commentList = [...this.commentList, ...results]
      this.totalCount = totalCount || ''
      this.loading = false
    },
    // 收藏  让他取反
    toggleCollectFn () {
      this.artObj.is_collected = !this.artObj.is_collected
    }
  }
}
</script>

<style scoped lang="less">
.cmt-list {
  padding: 10px;
  .cmt-item {
    padding: 15px 0;
    + .cmt-item {
      border-top: 1px solid #f8f8f8;
    }
    .cmt-header {
      display: flex;
      align-items: center;
      justify-content: space-between;
      .cmt-header-left {
        display: flex;
        align-items: center;
        .avatar {
          width: 40px;
          height: 40px;
          background-color: #f8f8f8;
          border-radius: 50%;
          margin-right: 15px;
        }
        .uname {
          font-size: 12px;
        }
      }
    }
    .cmt-body {
      font-size: 14px;
      line-height: 28px;
      text-indent: 2em;
      margin-top: 6px;
      word-break: break-all;
    }
    .cmt-footer {
      font-size: 12px;
      color: gray;
      margin-top: 10px;
    }
  }
}
/*美化 - 文章详情 - 底部的评论页面 */
// 外层容器
.art-cmt-container-1 {
  padding-bottom: 46px;
}
.art-cmt-container-2 {
  padding-bottom: 80px;
}

// 发布评论的盒子 - 1
.add-cmt-box {
  position: fixed;
  bottom: 0;
  left: 0;
  width: 100%;
  box-sizing: border-box;
  background-color: white;
  display: flex;
  justify-content: space-between;
  align-items: center;
  height: 46px;
  line-height: 46px;
  padding-left: 10px;
  .ipt-cmt-div {
    flex: 1;
    border: 1px solid #efefef;
    border-radius: 15px;
    height: 30px;
    font-size: 12px;
    line-height: 30px;
    padding-left: 15px;
    margin-left: 10px;
    background-color: #f8f8f8;
  }
  .icon-box {
    width: 40%;
    display: flex;
    justify-content: space-evenly;
    line-height: 0;
  }
}

.child {
  width: 20px;
  height: 20px;
  background: #f2f3f5;
}

// 发布评论的盒子 - 2
.cmt-box {
  position: fixed;
  bottom: 0;
  left: 0;
  width: 100%;
  height: 80px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-size: 12px;
  padding-left: 10px;
  box-sizing: border-box;
  background-color: white;
  textarea {
    flex: 1;
    height: 66%;
    border: 1px solid #efefef;
    background-color: #f8f8f8;
    resize: none;
    border-radius: 6px;
    padding: 5px;
  }
  .van-button {
    height: 100%;
    border: none;
  }
}
</style>
